Incomming cURL being denied.

Hello.
I've recently installed zPanel on a server of mine and incomming cURL requests are being denied, I believe this is either a PHP problem or an apache problem.
Does anyone have any ideas as of to what the problem could be?
Thanks!

But, then again, I came across a few forum posts via Google that suggest that cURL is already installed on CentOS, but disabled by default -- and all that is needed is to uncomment ;extension=curl.so in your php.ini.